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The
Sega CD was one of the first CD-ROM based gaming consoles. The extra
storage space this medium allowed gave rise to inclusion of full motion
video, higher quality audio, and improved graphics in games.

In similar fashion to the Sega 32X,
the original two Sega CD models (dubbed Sega CD I and II) required a
Genesis console to operate. Both models plugged into the bottom of the
Genesis, with CD I fitting the older version of the Genesis and the CD
II fitting the newer version.

The Sega CD I

One of the hallmark features of the Sega CD was the inclusion of full motion video
(FMV) in games. Though this was revolutionary at the time, the low
number of colors (512) the console was able to produce effectively made
low quality FMV. This was improved greatly with some Sega CD 32X games,
as these were capable of showing 32,768 colors.

Between North America, Japan, and Europe
approximately 221 Sega CD games were produced (including five Sega CD
32X games). Though a large number of these were original releases,
several were simply ports of existing Genesis games with extra content
and improved graphics (such as Mortal Kombat and Earthworm Jim).